▎ 摘　　要

NOVELTY - Method for preparing stable magnetic material for submucosal injection, involves (a) obtaining graphene by adopting Hummers method using graphite powder as raw material, (b) placing in diethylene glycol solution, and obtaining graphene solution by ultrasonic treatment, (c) preparing nano-ferroferric oxide particles generated on graphene nanosheets from ferric iron and ferrous iron, ferric chloride solution and ferrous sulfate heptahydrate in a molar ratio of 1.5:1, (d) ultrasonically treating the above-mentioned three solutions under, adding sodium hydroxide and ultrasonically treating for 15-20 minutes to obtain a black precipitate, (e) placing the black precipitate in a water bath at 40-65 degrees C for 15 minutes to 30 minutes to obtain a graphene-ferric oxide nanocomposite-containing mixture, and (f) repeatedly washing the mixture for 3-5 times with deionized water and ethanol to obtain a purified graphene-ferric oxide nanocomposite. USE - The method is useful for preparing stable magnetic material for submucosal injection. ADVANTAGE - The magnetic material has strong magnetic properties, high stability and high stable graphene-ferroferric oxide composite material opens up a wider range of applications in many fields, is not easy to biodegraded and biologically safe, plays key role in complex endoscopic submucosal dissection/endoscopic mucosal resection operations, preoperative endoscopic marking positioning, long-term positioning marking, and tracking lesions and clinical application scenarios which require long mucosal uplift maintenance time.